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[quicwg/base-drafts] http: Allow unquoted tokens in Alt-Svc quic parameter (#3063)

Peter Wu <notifications@github.com> Tue, 24 September 2019 00:45 UTC

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Date: Mon, 23 Sep 2019 17:45:29 -0700
From: Peter Wu <notifications@github.com>
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Subject: [quicwg/base-drafts] http: Allow unquoted tokens in Alt-Svc quic parameter (#3063)
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According to https://tools.ietf.org/html/rfc7838#section-3, the Alt-Svc parameter value can be unquoted:
```
    parameter = token "=" ( token / quoted-string )
```

This means that this can be written:
```
alt-svc: h3=":443";quic=1
```
instead of only:
```
alt-svc: h3=":443";quic="1"
```

The current text in https://tools.ietf.org/html/draft-ietf-quic-http-23#section-3.2.1 forbids the unquoted variant which is an additional constraint on the RFC 7838 grammar. Should unquoted `quic` parameter values also be permitted?

Note that this does not change the situation when multiple versions are supported since an unquoted "token" type is not allowed to contain commas.

See also the discussion in #3059.

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